微流体光波导器件研究进展

微流体光波导器件是一种基于微流体调控的新型光学功能器件,在生物医学和环境监测等领域中具有广阔的应用前景。介绍了微流体光波导器件的基本结构,分析了微流体光波导器件的工作原理,阐述了微流体光波导器件的研究现状,并指出了其发展趋势。     

集成波导器件在光纤通信中的应用

光纤通信技术开辟了大容量、高速和低损耗的通信方式。集成波导光器件是构成光通信网和系统的重要组成部分,研制这些器件具有十分重要的现实意义。当前光通信中有代表性的器件是激光器、接收器、调制器、滤波器和控制器等。本文以光通信中三种重要的波导器件──光调制器、滤光器和定向耦合器为例,来介绍当前以光通信为主要应用领域的光波导器件的特点和应用。一、光波导技术１．基于ＬｉＮｂＯ３的光波导技术光波导器件可采用无定形体材料、铁电材料和半导体材料。采用的无定形体材料包括有机聚合物波导和玻璃波导。热光调制器就可以制作…     

SOI材料在光电子学中的应用

SOI材料是应用于硅基光电子学中的一种重要的光波导材料。近年来随着SOI材料制备和加工技术的成熟,SOI基光波导器件的研究日益受到人们的重视。文章介绍了SOI材料在光电子学领域的一些具体应用,包括了在热光器件、电光器件、亚微米波导器件与光纤的耦合器以及光电子集成芯片等方面的最新研究进展。更小的波导截面尺寸是未来SOI光波导器件发展的必然趋势。     

环形波导谐振腔集成光学器件

介绍环形谐振腔光波导器件,包括波导材料和制作工艺,分析它在光通信和光传感领域中的应用,表明环形波导谐振腔是一种非常有应用价值的光波导器件。     

SOI纳米线波导和相关器件研究进展

SOI纳米线波导具有对光场限制作用强、传输损耗低、弯曲半径小、集成度高、与传统CMOS工艺兼容等优点,采用SOI纳米线波导能够大大缩小光子器件的长度和面积,提高器件工作速度和效率,降低器件功耗.介绍了SOI纳米线波导在模式、损耗、偏振等方面与传统大尺寸硅基波导所表现出来的不同特性,评述了当前关于SOI纳米线波导和基于SOI纳米线波导光子器件的最新研究进展.     

斜磁法应用于铁氧体波导器件

介绍了铁氧体波导器件在采用斜磁法后技术性能上的改变和提高,证明了这种新方法在研制波导器件时的实用性和有效性.     

从OFC 2003看平面光波导器件的发展动向

概述了2003年OFC会议上报道的平面光波导器件，着重介绍了平面光波导器件在新材料、新工艺、新结构方面的新进展和发展方向。     

平面光波导器件及应用分析

分析了平面光波导器件的关键技术及其应用情况．介绍了平面光波导器件的几种不同种类,包括硅基体沉积二氧化硅光波导,铌酸锂镀金属膜光波导,聚合物(Polymer)光波导等组成．利用平面光波导技术,可制造出波分复用器、解复用器、光开关、耦合器、阵列波导光栅等各种不同的集成光学器件．     

波导型能量选择电磁防护器件设计与实现

提出了一种用于矩形波导的波导型能量选择电磁防护器件。该器件在波导内壁加装了加载PIN二极管单元的超表面阵列,可根据波导内电磁波场强大小自适应切换加载二极管单元的状态,实现基于波导传输功率的传输特性变化。为验证可行性和器件性能,本文基于WR430波导进行了器件设计和实现。仿真和测试结果表明,当入射波功率低于25 dBm时,该器件在1.8～2.2 GHz内的插入损耗不高于1.5 dB;当入射波功率高于37 dBm时,该器件在中心频率处的隔离度不低于20 dB。仿真与测试结果吻合一致,证明所提波导型能量选择电磁防护器件具备较好的电磁防护能力。     

二氧化硅平面光波导器件的研究进展

二氧化硅平面光波导(PLC)器件以其低损耗、高工艺容差,以及与CMOS工艺兼容和与单模光纤模场匹配良好等优点,在光通信、光互连和集成光学中得到了广泛的应用.文章综述了二氧化硅平面光波导器件及其应用的进展,重点针对分束器、阵列波导光栅、可调光衰减器及其集成器件的最新研究进行了介绍,对未来发展趋势进行了展望.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.